Event-Driven LED Driver PSR Without Opto-Couplers
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Solution Overview
Problem
Conventional LED driver circuits require external components like opto-couplers for accurate primary side regulation (PSR) and Power Factor Correction (PFC), which are expensive and prone to high frequency errors, and lack efficient dimming functionality without additional components.
Innovation Solution
An event-driven architecture system comprising an input module, computing module, subtractor module, gain module, accumulator module, analog to digital module, multiplier module, digital to analog module, Pulse Width Modulation (PWM) module, and control module, which regulates primary side current to achieve desired secondary side currents without external components by calculating error signals and controlling switch ON/OFF times using firmware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional primary side regulation uses opto-couplers for accurate current regulation, then regulation accuracy is improved, but system cost increases and high frequency errors are introduced
Solution Approach 1:
The patent extracts and eliminates the opto-coupler from the system by implementing primary side regulation entirely through PCB trace sensing and firmware-based correction algorithms, removing the need for external isolation components while maintaining regulation accuracy
Solution Approach 2:
The patent replaces the optical coupling mechanism with an electrical sensing mechanism using PCB traces and digital signal processing, substituting mechanical/optical components with firmware-based correction systems that achieve the same regulation function without external components
2Measurement precision
If high correction frequency is used to correct Peak Regulation Voltage at multiple points, then regulation precision is improved, but susceptibility to high frequency errors and noise increases
Solution Approach 1:
The patent implements PRV correction at specific periodic intervals within the half cycle rather than continuously at high frequency, using event-driven correction points that reduce noise susceptibility while maintaining adequate regulation precision through strategically timed measurements
3Reliability
If external components like opto-couplers are used for PSR and PFC, then regulation functionality is achieved, but system cost and component count increase
Solution Approach 1:
The patent implements a unified firmware-based control system that handles both Primary Side Regulation and Power Factor Correction functions through a single integrated controller, eliminating the need for separate external components for each function and reducing overall system complexity
Solution Approach 2:
The system uses the existing PCB traces and internal controller resources to perform regulation functions, making the system self-sufficient without requiring external opto-couplers or additional isolation components, thereby reducing bill of materials cost and component count
Data Source
AI summary
The present invention discloses system and method to regulate primary side current using an event driven architecture in LED circuit. The system (100) performs a primary side regulation (PSR) of isolated or non-isolated LED driver topology such as fly back system. The primary side peak voltage or current is regulated to achieve desired secondary side currents without the need of additional external components. The architecture combines firmware and hardware to realize PSR. The method (200) effectively combines input wave shaping (Active PFC), dimming and PSR to achieve accurate secondary side currents. The method (200) corrects the Peak Regulation Voltage or current (PRV) of primary loop to meet desired half cycle reference voltage or current, which in turn achieves the desired secondary loop current in LED circuit.